Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency....

Certain passive filters incorporate expensive inductors designed not to exceed unity gain. These filters may exhibit reduced attenuation efficacy at frequencies below the audio range.

Active filters consist of operational amplifiers, resistors, and capacitors.

Employed in audio processing, telecommunications, and power supply units...